nacke



n (No Model.) 43 sheets-Sheen 1. A. NACKE. SGRBW CUTTING TOOL.

Patented June 12 llllllll nA Ferias. Pmwmugnumn mma-mon. n. c4

- 3 Sheets-Sheet 2. A. NACREl (No Model.)

SCREW CUTTING TOOL.

June 12,1883.

Patented (No Model.) 3 Sheets-Sheet 3. A. NACKB.

\ SCREW CUTTING TOOL. y l

No. 279,495. Y Patented June 12,1883.

UNITED STATES PATEN T OFFICE.

ARNOLD NAcEiE7 or PHILADELPHIA, PENNSYLVANIA, AssiGNon To LEDIG a HEERLEIN, oE sAME PLACE.

SCREW-CUTTING TOOL.

SPECIFICATION forming' part of Letters Patent No. 279,495, dated June 12, 1883.

Application led Novemhertl, 18E-2. (No model.)

To all whom it may concern:

Be it known that I, ARNOLD NAcKE, of

and State of Pennsylvania, have invented certain Improvements in Screw-Cutting Tools, of

which the following is a specification.

` This invention relates to a screw cutting or frasing tool wherein a series of radially moving or expanding cutters are applied to pivoted Io arms mounted in asupporting-body, and connected with devices whereby they may be operated, and with means whereby they are automatically moved to open the cutters whenever the screw-thread has attained a predeter- I5 mined length."

The improvements consist in the various dctails of construction relating to the tool, which will be hereinafter described in detail, and to a supplemental gage adapted to effect the simultaneous and uniform adjustment of the cutters in order to adapt the tool for threading screws of different diameters.

Referring to the accompanying drawings, Figure'l is a longitudinal central section of my improved tool. Fig. 2 is a cross-section -on the line m Fig. 3 is an elevation ofthe body portion of the tool, one-half being represented in section. Fig. 4 is an end view of the same. Fig. 5 is an elevation, one-half in section, of

3o the central portion of the body. Fig. 6 is an elevation, one-half in section, of the central device whereby the cutter-carrying arms or levers are loekedand released. Fig. 7 is a perspective of one of the cutter-supporting arms. Fig. 8 is a rear end view of the com'- plete tool. Fig. 9 is a side elevation of the rear end portion. Fig. l0 is a face View of the device for adjusting the cutters concentrically. Fig. 11 is a view illustrating the action l4o of the jaw-operating lever and adjacent parts.

Referring to the drawings, A represents the Inainbody portion of the tool, made of substantially cylindrical form, with a series (usually four) of longitudinal slots, a, therein to receive the levers B, the forward'ends of which are provided each with a cutting or frasing tool,

C. Each lever B is secured in the body A, at

a central point, by means of a transverse pivot,

b, whereby the series of levers are permitted 5o to move to and from each other at their for- `ward ends in order to close the cutters inward toward the center in position to operate upon the blank to be threaded, or.to admit of their Philadelphia, in the county of Philadelphia,

being separated when the nished screw is to be released. Each lever B is acted upon by a fiat spring, D, secured to the body, as shown in Fig. l, tending to throw the levers and cutters apart at the forward end when released.`

For the purpose of operating the levers I mount centrally wit-hin the body A a second- 6o ary body-section, E, upon which the body A is free to slide endwise, as shown in Fig.V 5.

The forward end of the inner section, E, is provided with an angular neck, C, which iits within a corresponding angular opening, d, in the outside body, A, whereby the two body-sections A and E are compelled to rotate in unison, although one is free to ,slide endwisc in respect to the other. Vithin the rear end of each cutter-supporting lever B, I pivot one 7o end of a link, G, the opposite end of which is pivoted in a slot.- in the central body, E, in the position indicated in the drawings. Vhen, therefore, the outer body-section, A, is moved A forward upon the inner section, E, the links are caused to assume an upright position, thereby operating thelevers Bl in such manner as to throw the cutters inward to operati ve position.

A backward movement of the body A, 011 the contrary, operates the levers in such manner 8o Aas to separate the cutters from each other.

This movement of the body-sections A and E- one in relation to the other-is effected by means which will now be explained. The inner section, E, has its end enlarged to a diam- 8 5 eter equal to that of the section A, and is provided with. a peripheral groove, e, wherein an encircling-ring, H, is loosely mounted. In like Inanner the rearend of the section A is provided with a circumferential groove con- 9o taining a loose ring, I. The two rings are connected and prevented from turning in relation to each other by means of an encircling band or hoop, J, having on its inner surface, in the direction of its axis, ribs j, which are seated loosely in corresponding grooves in the two rings. This connection, while preventing the rings from rotating in relation to cach other, as before stated, admits of the ring I moving laterally with the outer body-section, A, to and 10C from the ring H. y

To the opposite sides of the ring4 H, lf` pivot vexterior ofthe ring I, I mount two rollers, N.

On moving the hand-leverto the right, the levers L, resting at their forward ends upon the pins as fulcrums, have their rear ends carried to the right by thc hand-lever, whereby they are caused to act against the rollers N,

thereby forcing the ring I away from the ring H and moving the body-sections A forward upon the inner section, E, so as to close the cutters in the manner before explained. Screws M inserted through the rear ends of the camlevers L, encounter the hand-lever and serve to limit mot-ion of said levers L in relation to the lever K. The forward ends of the'levers L, encountering in turn the studs i, serve to limit the motion of the hand-lever in that direction by which the jaws are closed.

By adjusting the screw M the forward motion of the hand-lever may be regulated with great accuracy, and thus the cutters prevented from closing so near each other as to reduce the diameter ofthe screw below the limit desired.

For thc purpose of throwing the lever backward when relieved from pressure, a spiral spring, O, is applied thereto, and arranged to bear at one end against the ring II or a stud thereon. i

For the purpose of giving direct and solid support to the cutter-carrying levers B during the action of the cutters, I mount centrally within the inner body-section, E, a longitudinally-sliding tube, P, having its rear end enlarged and provided with forwardly-cxtending arms olf, which extend through openings in the body A in position to engage beneaththe rear ends of the respective levers B.

Spiral springs Q, seated in the rear end of the inner section, E, are secured at one end to said section and at the opposite end to the rear end of thc sliding tube P. Whenever, therefore, the rear ends ofthe levers are moved apart to throw the cutters inward,the tube P is moved forward by the action ofthe spiral springs, and the arms n caused to rest beneath the ends of the levers B, as shown in Fig. l, thus holding the levers solidly in their operative positions.

The central. tube, P, may be extended forward between the levers B in position to be encountered by the end of the screw or other object threaded by the tool whenever the same has reached a predetermined length.

By means of the screw the tube P will be forced backward and the arms n removed from beneath the levers B, whereupon the latter will be immediately actuated by means of the springs D, and their forward ends thrown apart, so as to separate the cutters.

For the purpose of adjusting the device for automatically producing screws of greater or lesslength, as required, the central tube, P, is provided with a central longitudinal screw, R, the forward end of which has a loose swiveling head, S.

By adjusting the screw forward and backward, and thereby virtually lengthening or shortening the tube P, the automatic release of the cutters may be effected whenever the screw has entered a given dist-ance beyond the cutters.

The forward ends of the levers B are split or divided, as shown, to embrace the cutters, and are provided with transverse screws T, whereby the divided .ends may be compressed upon the cutters.

By adjusting the cutters C inward and outward from the ends of the levers the tool may -be adapted for the cutting of screws of different diameters.

To secure the proper action of the tool it is necessary that the several cutters shall be adjusted with their inner ends at exactly the same distance apart from the axis of rotation. To secure this adjustment with readiness and certainty, I make use of a plate, U, such as represented in Fig. l0, provided with concentric slots p and eccentric slots q.

Each of the levers B is provided at its ends with a fixed stud, lr, and each of the cutters C provided with Ya similar stud, s.Y

In making use of the adjusting-plate U the cutters are first released, after which the plate is applied, as indicated by dotted lines in Fig. I, the concentric slots p receiving the studs upon the ends of the arms, and being compelled thereby torevolve about a center coincident with that of the tool, while the eccentric slots q receive'the studs upon the cutters, so that as the plate is turned the eccentric slots will `move the several cutters inward or outward to precisely the same extent. The cutters are secured in position while thus held to the plate, after which the plate is removed.

Vhile it is preferred to make use ofthe studs and slots as a means of holding the plate in position, it is manifest that any other suitable guide which will cause the plate to revolve about the central axis of the tube may be substituted. A simple means to this end will be an overhanging flange to encircle the outer ends of the cutter-supporting arms.

Having thus described my invention, what I claim isl. The combination of the body-sections A and E, arranged to slide one upon the other, the cutter-supporting levers, the links, the loose rings mounted one in each of the bodysections, and means, substantially as described,

connecting said rings with each other, whereby they maybe moved to and from each other for the purpose of moving one body-section in relation to the other to effect the opening and closing of the cutters.

2. In combination with the body sections A and E, the cutter-supporting levers B, and the central slide provided with arms adapted IOO IIO

to engage with the rear ends of the cutter-supporting levers, substantially as shown.

3. In combination with the body-sections, sliding one upon the other, the cutter-support` ing levers, the links, and the slide for locking the levers, provided with an adjustable or eX- tensible device, R, at its forward end, whereby the tool may be adjusted for automatically determining the length of screws produced.

4. In a screw-cutting tool, the combination of the external body, A, provided with longitudinal slots, the cuttersupporting` levers mounted in said slots, and the internal body E, provided with an angular neck or portion seated in a corresponding1 cavity in the body A, and links connecting the levers with the internal body-section, substantially as described. 5. In a screw-cutting tool, the combination of the longitudinal levers provided with cutters at their forward ends, means, substantially as described, for moving said levers on their pivots, and the spring-actuated locking-slide adapted to engage with and hold the rear end of the levers in an operative position, whereby the automatic locking of the levers is effected.

6. In combination with the two body-sections sliding oue in relation to the other, the links, and the cutter-supporting levers, the central slide, I?, provided with locking-arms to hold the levers, and a spring, applied substantially as shown, to urge the locking-slide forward.

7. The combination of the body-sections, the cutter-supporting levers, means, substantially as described, for operating said'levers with the rings applied to the body-sections, and a handlever and connecting devices, substantially as shown, adapted to move 011e of said rings laterally with respect to the other.

8. In combination with the two rings applied plied as and for the purpose described, theA hand-lever7 the stoppins, the pivoted cams or `arms applied to the ends of the l1and-lever,

and the adj usting-screws whereby the position of said arms in respect to the hand-lever may be varied.

10. .Iointly with the cutter-supports and the cutters C, adjustably mounted therein, a plate, U, constructed and arranged to operate in connection with the cutter's and supports for the purpose of effecting the uniform adjustment of the cutters, substantially as described and shown.

11. J ointly with the cutter-supports B, havg ing studs r, and adjustable cutters C, provided with studs s, the adjusting-plate U, provided with concentric slots p and eccentric slots qto act upon therrespective cutters and effect their uniform adjustment.

12. .Iointly with a screw-cutting too] having a series of cutters adjustable to and from the center, a detachable plate adapted to revolve concentrically upon the cutters, said plate being provided with eccentric bearings to act upon the respective cutters and eifect their uniform adjustment, substantially as described.

ARNOLD NACKE.

Vitnesses FREDK. BREITINGER, F. L. BREITINGER.` 

